Key points

• Emergency room visits and hospitalizations following emergency room visits for bronchiolitis are showing a trend toward stabilization at a very high level in mainland France.

• In week 48, hospitalizations for bronchiolitis accounted for half of all hospitalizations following an emergency department visit among children under two years of age for the fifth consecutive week.

• The situation varies by region, with a marked increase in bronchiolitis surveillance indicators in Bourgogne-Franche-Comté, a continued increase in Occitanie, and a decrease in Île-de-France, Hauts-de-France, and French Guiana, though levels remain high.